This alert expired on 16 March 2026 at 06:00 UTC. It is kept here as a record.
It is the 15th strongest of the 126 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued March 15 at 6:48PM EDT until March 16 at 2:00AM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- August 9, 2026 · score 22 · 0.0 km
- August 8, 2026 · score 22 · 0.0 km
- August 7, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 59 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 44.3000, -85.6000 |
| Nearest City | Traverse City (51 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-15T22:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.2f20bd3c9fdbe7c41cb9793526262a35 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Allegan, MI; Barry, MI; Calhoun, MI; Eaton, MI; Ingham, MI; Jackson, MI; Kalamazoo, MI; Van Buren, MI; St Joseph to South Haven MI; South Haven to Holland MI |
| Headline | Severe Thunderstorm Watch issued March 15 at 6:48PM EDT until March 16 at 2:00AM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-16T02:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2f20bd3c9fdbe7c41cb9793526262a35565f9490.001.1","noaa_urn:oid:2.49.0.1.840.0.2f20bd3c9fdbe7c41cb9793526262a35565f9490.002.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.